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<?php |
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namespace Maps\Presentation; |
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use Maps\Elements\Location; |
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use Xml; |
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/** |
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* Class to format geographical data to KML. |
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* |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class KmlFormatter { |
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/** |
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* @var array |
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*/ |
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private $params; |
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/** |
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* @var Location[] |
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*/ |
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private $placemarks; |
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public function __construct( array $params = [] ) { |
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$this->params = $params; |
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$this->clearElements(); |
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} |
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/** |
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* Clears all set geographical objects. |
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*/ |
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public function clearElements() { |
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$this->clearPlacemarks(); |
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} |
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/** |
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* Clears all set placemarks. |
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*/ |
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public function clearPlacemarks() { |
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$this->placemarks = []; |
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} |
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/** |
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* Builds and returns KML representing the set geographical objects. |
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*/ |
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public function getKML(): string { |
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$elements = $this->getKMLElements(); |
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// http://earth.google.com/kml/2.2 |
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return <<<EOT |
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<?xml version="1.0" encoding="UTF-8"?> |
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<kml xmlns="http://www.opengis.net/kml/2.2"> |
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<Document> |
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$elements |
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</Document> |
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</kml> |
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EOT; |
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} |
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/** |
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* Returns the KML for all set geographical objects. |
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*/ |
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private function getKMLElements(): string { |
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$elements = []; |
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$elements = array_merge( $elements, $this->getPlaceMarks() ); |
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return implode( "\n", $elements ); |
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} |
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/** |
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* Returns KML for all set placemarks in a list, where each element is |
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* a KML node representing a placemark. |
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*/ |
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private function getPlaceMarks(): array { |
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$placeMarks = []; |
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foreach ( $this->placemarks as $location ) { |
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$placeMarks[] = $this->getKMLForLocation( $location ); |
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} |
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return $placeMarks; |
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} |
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private function getKMLForLocation( Location $location ): string { |
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$name = '<name><![CDATA[ ' . $location->getTitle() . ']]></name>'; |
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$description = '<description><![CDATA[ ' . $location->getText() . ']]></description>'; |
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$coordinates = $location->getCoordinates(); |
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// lon,lat[,alt] |
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$coordinates = Xml::element( |
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'coordinates', |
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[], |
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$coordinates->getLongitude() . ',' . $coordinates->getLatitude() . ',0' |
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); |
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return <<<EOT |
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<Placemark> |
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$name |
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$description |
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<Point> |
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$coordinates |
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</Point> |
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</Placemark> |
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EOT; |
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} |
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/** |
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* @param Location[] $placemarks |
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*/ |
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public function addPlacemarks( array $placemarks ) { |
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foreach ( $placemarks as $placemark ) { |
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$this->placemarks[] = $placemark; |
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} |
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} |
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} |
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JeroenDeDauw /
Maps
